Question 208046
This is a classic factoring by grouping problem!  Group the first two and the last two terms and factor the common factor in each grouping:


nx-ny+12x-12y
n(x-y) + 12(x-y)


Take out the common factor of (x-y):

(x-y)(n+12)


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R^2


Dr. Robert J. Rapalje
Seminole Community College
Altamonte Springs Campus
Florida